```baml title="baml_src/story.baml" focus={1-16}
class Story {
  title: string
  content: string
}

function WriteMeAStory(prompt: string) -> Story {
  client OpenAI
  prompt #"
    Act as a storyteller.

    { ctx.output_format }

    { _.role('user') }
    Once upon a time {prompt}
  "#
}

test WriteMeAStory {
  functions [WriteMeAStory]
  args {
    prompt "The Universe"
  }

}
```